Unable to create injector, see the following errors:

1) [Guice/MissingImplementation]: No implementation for base.Optional<String> was bound.

Did you mean?
    * util.Optional<String> bound at MissingImplementationErrorTest$MismatchedOptionalsModule.provideString(MissingImplementationErrorTest.java:218)

Requested by:
1  : MissingImplementationErrorTest$MismatchedOptionalsModule.provideInteger(MissingImplementationErrorTest.java:223)
      \_ for 1st parameter dep
     at MissingImplementationErrorTest$MismatchedOptionalsModule.provideInteger(MissingImplementationErrorTest.java:223)

Learn more:
  https://github.com/google/guice/wiki/MISSING_IMPLEMENTATION

1 error

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Full classname legend:
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MissingImplementationErrorTest$MismatchedOptionalsModule: "com.google.inject.errors.MissingImplementationErrorTest$MismatchedOptionalsModule"
base.Optional:                                            "com.google.common.base.Optional"
util.Optional:                                            "java.util.Optional"
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End of classname legend:
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